Item 1.01 Entry into a Material Definitive Agreement.

Registration Rights Agreement

Upon the Closing, the Company, on the one hand, and certain former equityholders of Eos HoldCo, on the other hand, entered into a registration rights agreement (the "Registration Rights Agreement"). Under the Registration Rights Agreement, the Company is required to, within forty-five (45) days after the Closing, file a registration statement registering the resale of all or any portion of the Company's common stock issued as merger consideration under the Merger Agreement (the "Registrable Securities"). Holders of the Registrable Securities will also have certain "piggy-back" registration rights with respect to registration statements and rights to require the Company to register for resale such securities pursuant to Rule 415 under the Securities Act. The Company will bear the expenses incurred in connection with the filing of any such registration statements. The Registration Rights Agreement does not contemplate the payment of penalties or liquidated damages as a result of a failure to register, or delays with respect to the registration of, the Registrable Securities.

As part of the Registration Rights Agreement, holders of the Registrable Securities agreed not to transfer any such Registrable Securities until the earlier of (A) one year after the Closing or (B) subsequent to the Closing, (x) if the last sale price of the Company's common stock equals or exceeds $12.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the Closing or (y) the date on which the Company completes a liquidation, merger, capital stock exchange, reorganization or other similar transaction that results in all of the Company's stockholders having the right to exchange their shares of the Company's common stock for cash, securities or other property.

Under the Registration Rights Agreement, we agree to indemnify the stockholders holding Registrable Securities and certain persons or entities related to such stockholders against any losses or damages resulting from any untrue statement or omission of a material fact in any prospectus or prospectus pursuant to which they sell registrable securities, unless the liability arose from their misstatement or omission, and these stockholders, if registrable securities held by these stockholders are included in the securities as to which registration, qualification or compliance is being effected, agree to indemnify the Company and certain persons or entities related to the Company against all losses caused by their misstatements or omissions in those documents.

This summary is qualified in its entirety by reference to the text of the Registration Rights Agreement, which is included as Exhibit 10.9 to this Current Report and is incorporated herein by reference.





                                       2





Sponsor Earnout Letter


In connection with the Merger Agreement, BMRG entered into a Sponsor Earnout Letter with B. Riley Principal Sponsor Co. II, LLC (the "Sponsor"), dated . . .

Item 2.01 Completion of Acquisition or Disposition of Assets.

The disclosure set forth in the "Introductory Note" above is incorporated by reference into this Item 2.01. The material terms and conditions of the Merger Agreement are described in the Proxy Statement in the section entitled "The Business Combination Proposal - The Merger Agreement," which is incorporated herein by reference.

At a special meeting of the stockholders of BMRG held on November 12, 2020 (the "Special Meeting"), the Company's stockholders considered and adopted, among other matters, the Merger Agreement. On November 16, 2020 the parties completed the Business Combination.





                                       3




At the Special Meeting, holders of 6,442,195 shares of BMRG's common stock sold in BMRG's initial public offering ("Public Shares") exercised their right to redeem those shares for cash at a price of $10.10 per share, for an aggregate of approximately $65,066,169.50. The per share redemption price of $10.10 for holders of Public Shares electing redemption was paid out of BMRG's Trust Account, which, after taking into account the redemption but before payment of any transaction expenses, had a balance immediately prior to the Closing of approximately $111.7 million.

Immediately after giving effect to the Business Combination (including as a result of the redemptions described above, the conversion of all outstanding founder shares into shares of Class A common stock on a one-for-one basis at the Closing pursuant to BMRG's amended and restated certificate of incorporation, the conversion of all shares of Class A common stock in shares of the Company's common stock, and the issuance of an additional 4,000,000 shares of the Company's common stock in the PIPE Financing as described in Item 3.02 below), there were approximately 49,813,547 shares of the Company's common stock issued and outstanding and warrants to purchase approximately 9,075,000 million shares of the Company's common stock issued and outstanding. The number of shares of common stock outstanding includes 29,730,341 shares issued to former Eos unitholders in the Business Combination, which was calculated as 30 million shares less the in-the-money value of pre Business Combination outstanding options to purchase Eos equity, based on the effective per-unit price of the Business Combination.

Prior the Closing, each unit of BMRG consisted of one share of Class A common stock and one-half of one redeemable warrant of the Company, whereby each whole warrant entitled the holder to purchase one share of Class A common stock at an exercise price of $11.50 per share. As a result of the Closing, BMRG's units have automatically separated into the component securities and, as a result, are no longer traded as a separate security and have been delisted. On November 17, 2020, our Common Stock and public warrants began trading on The Nasdaq Stock Market ("Nasdaq") under the trading symbols "EOSE" and "EOSEW," respectively.

Upon the closing, BMRG's amended and restated certificate of incorporation, dated May 19, 2020, was replaced with the third amended and restated certificate of incorporation of Eos Energy (the "Amended Certificate"), which, among other . . .

Item 2.02 Results of Operations and Financial Condition.

Certain annual and quarterly financial information regarding Eos OpCo is included in the Prospectus, in the section titled "Management's Discussion and Analysis of Financial Condition and Results of Operations of Eos", which is incorporated herein by reference. The disclosure contained in Item 2.01 of this Current Report is also incorporated herein by reference.

Item 3.02 Unregistered Sales of Equity Securities.

On November 16, 2020, immediately prior to the Closing, BMRG issued to a number of purchasers (each, a "PIPE Investor") an aggregate of 4,000,000 shares of BMRG's Class A common stock (the "PIPE Shares"), for a purchase price of $10.00 per share and an aggregate purchase price of $40,000,000, pursuant to separate subscription agreements (each, a "Subscription Agreement"). Pursuant to the Subscription Agreements, the Company gave certain registration rights to the Subscribers with respect to the PIPE Shares. The shares of Class A common stock issued to the PIPE Investors pursuant to the Subscription Agreements were not registered under the Securities Act in reliance on the exemption from registration provided by Section 4(a)(2) of the Securities Act and/or Regulation D promulgated thereunder. The foregoing description of the Subscription Agreements does not purport to be complete and is qualified in its entirety by reference to the full text of the form of Subscription Agreement, a copy of which is attached hereto as Exhibit 10.7 and is incorporated herein by reference.





                                       9




Upon the Closing, (i) all shares of BMRG's Class B common stock were reclassified to Class A common stock; and (ii) immediately following this reclassification, all shares of BMRG's Class A common stock were reclassified to our common stock. The shares of Class A common stock issued upon reclassification of the Class B common Stock were not registered under the Securities Act in reliance on the exemption from registration provided by Section 3(a)(9) of the Securities Act.

The securities issued to the former equityholders of Eos HoldCo pursuant to the Merger Agreement have not been registered under the Securities Act in reliance on the exemption from registration provided by Section 4(a)(2) of the Securities Act and/or Regulation D promulgated thereunder. Item 2.01 of this Current Report discusses the transactions contemplated by the Merger Agreement, and is incorporated herein by reference.

The PIPE Shares issued to the PIPE Investors pursuant to the Subscription Agreements have not been registered under the Securities Act in reliance on the exemption from registration provided by Section 4(a)(2) of the Securities Act and/or Regulation D promulgated thereunder. Item 1.01 of this Current Report discusses the transactions contemplated by the Subscription Agreements, and is incorporated herein by reference.

Item 3.03 Material Modification to Rights of Security Holders.

Amended and Restated Certificate of Incorporation

Upon the Closing, BMRG's second amended and restated certificate of incorporation, dated May 19, 2020, was replaced with the Amended Certificate, which, among other things:

(a) changes the Registrant's name to "Eos Energy Enterprises, Inc." from "B.

Riley Principal Merger Corp. II";



(b) increases the authorized capital stock from 126,000,000 shares, which


     consisted of 100,000,000 shares of Class A common stock, 25,000,000 shares of
     Class B common stock and 1,000,000 shares of preferred stock, par value
     $0.0001 per share, to 201,000,000 shares, which consists of 200,000,000
     shares of common stock, and 1,000,000 shares of preferred stock;



(c) provides that any amendment to certain provisions of the Company's charter


     and any amendment to the Company's bylaws will require the approval of the
     holders of at least 66⅔% of the Company's then-outstanding shares of
     capital stock entitled to vote generally at an election of directors;



(d) provides that the Company opts out of Section 203 of the Delaware General


     Corporation Law, which prevents certain Delaware corporations, under certain
     circumstances, from engaging in a "business combination" with certain
     "interested stockholders" and their affiliates



(e) provides that certain amendments to and actions under the Amended Certificate


     are subject to the director nomination agreement, dated November 16, 2020,
     between the Company and the other parties thereto (the "Director Nomination
     Agreement");



(f) changes the classification of the board of directors from two classes to


     three classes of directors, with each class elected for staggered terms; and



(g) provides for a waiver of the doctrine of corporate opportunities for (i) any


     director of the Company who is not an employee of the Company or any of its
     subsidiaries or (ii) any person with the right to designate any such director
     pursuant to the Director Nomination Agreement (or any of such person's
     affiliates or its or their respective successors, principals, directors,
     officers, members, managers or employees).




                                       10




The stockholders of BMRG approved the Amended Certificate at the Special Meeting. This summary is qualified in its entirety by reference to the text of the Amended Certificate, which is included as Exhibit 3.1 to this Current Report and is incorporated herein by reference.





Amended and Restated Bylaws


Upon the Closing, BMRG's bylaws were amended and restated to be consistent with our Amended Certificate and to make certain other changes that our board of directors deems appropriate for a public operating company. This summary is qualified in its entirety by reference to the text of the amended and restated bylaws, which are included as Exhibit 3.2 to this Current Report and is incorporated herein by reference.

Item 4.01 Changes in Registrant's Certifying Accountant.

(a) Dismissal of independent registered public accounting firm

Marcum LLP ("Marcum") served as the independent registered public accounting firm for BMRG from its inception through the Closing. The firm of Deloitte & Touche LLP ("Deloitte") served as the independent registered public accounting firm for privately-held Eos OpCo prior to the Business Combination.

On November 13, 2020, the Board of Directors approved the engagement of Deloitte, and the dismissal of Marcum, as the Company's independent registered public accounting firm, effective as of the Closing. Accordingly, Marcum was informed that it would be dismissed as the Company's independent registered public accounting firm effective as of the Closing. On November 16, 2020, Marcum's dismissal was effective.

The report of Marcum on BMRG's, the Company's legal predecessor, balance sheet as of December 31, 2019 and the statements of operations, changes in stockholders' equity and cash flows for the period from June 3, 2019 (inception) to December 31, 2019, which included an explanatory paragraph as to the Company's ability to continue as a going concern, did not contain an adverse opinion or a disclaimer of opinion, and were not qualified or modified as to uncertainties, audit scope or accounting principles.

During the period from June 3, 2019 (inception) to December 31, 2019, and subsequent interim period through November 16, 2020, there were no disagreements between the Company and Marcum on any matter of accounting principles or practices, financial disclosure or auditing scope or procedure, which disagreements, if not resolved to the satisfaction of Marcum, would have caused it to make reference to the subject matter of the disagreements in its reports on BMRG's financial statements for such period.

During the period from June 3, 2019 (inception) to December 31, 2019, and subsequent interim period through November 16, 2020, there were no "reportable events" (as defined in Item 304(a)(1)(v) of Regulation S-K under the Exchange Act).

Eos OpCo provided Marcum with a copy of the disclosures made pursuant to this Item 4.01 prior to the filing of this Current Report and requested that Marcum furnish a letter addressed to the Commission, which is included as Exhibit 16.1 to this Current Report, stating whether it agrees with these disclosures, and, if not, stating the respects in which it does not agree.





                                       11

Item 5.01 Changes in Control of Registrant.

Reference is made to the disclosure in the Proxy Statement in the section titled "The Business Combination Proposal," which is incorporated herein by reference. Further reference is made to the disclosure in the Prospectus in the section titled "Summary of the Prospectus-The Business Combination," which is incorporated herein by reference. Further reference is made to the information contained in "Introductory Note" above and in Item 2.01 of this Current Report, which are incorporated herein by reference.

Immediately after giving effect to the Business Combination, there were approximately 49,813,547 million shares of the Company's common stock issued and outstanding and warrants to purchase approximately 9,075,000 million shares of the Company's common stock issued and outstanding. The number of shares of common stock outstanding includes 29,730,341 shares issued to former Eos unitholders in the Business Combination, which was calculated as 30 million shares less the in-the-money value of pre Business Combination outstanding options to purchase Eos equity, based on the effective per-unit price of the Business Combination.At that time, our executive officers and directors and their affiliated entities held approximately 20% of our outstanding shares of our common stock.

Item 5.02 Departure of Directors or Certain Officers; Election of Directors;


          Appointment of Certain Officers; Compensatory Arrangements of Certain
          Officers.



Appointment of Directors and Officers

The following persons are serving as executive officers and directors following the Closing. For biographical information concerning the executive officers and directors, see the disclosure in the Prospectus in the sections titled "Management," which is incorporated herein by reference.





Name                       Age                     Position
Joe Mastrangelo            51    Chief Executive Officer and Class II Director
Sagar Kurada               42    Chief Financial Officer
Mack Treece                61    Chief Strategic Alliances Officer
Dr. Balakrishnan G. Iyer   46    Chief Commercial Officer
Daniel Shribman            36    Class III Director
Russ Stidolph              45    Class III Director
Dr. Krishna Singh          73    Class III Director
Alex Dimitrief             61    Class II Director
Andrey Zibelman            63    Class I Director
Mariam "Mimi" Walters      58    Class I Director



Effective upon the Closing, all executive officers and directors of BMRG, other than Daniel Shribman, resigned as executive officers and directors of BMRG.





Indemnity Agreements


Item 1.01 of this Current Report discusses the indemnification agreements entered into between the Company and each of its directors and executive officers, and is incorporated herein by reference.





                                       12




2020 Equity Incentive Plan

At the Special Meeting, the BMRG stockholders considered and approved the B. Riley Principal Merger Corp. II 2020 Equity Incentive Plan (the "Incentive Plan") and reserved 6,000,000 shares of common stock for issuance thereunder; provided that the total number of shares that will be reserved, and that may be issued, under the Incentive Plan will automatically increase on the first trading day of each calendar year, beginning with calendar year 2021, by a number of shares equal to one percent (1%) of the total outstanding shares of common stock on the last day of the prior calendar year. Notwithstanding the foregoing, the Board may act prior to January 1st of a given year to provide that there will be no such increase in the share reserve for such year or that the increase in the share reserve for such year will be a lesser number of shares than would otherwise occur pursuant to the preceding sentence. The Incentive Plan was previously approved, subject to stockholder approval, by BMRG's board of directors on October 15, 2020. The Incentive Plan became effective immediately upon the Closing of the Business Combination. A committee of at least two people appointed by our Board (or, if no such committee has been appointed, our Board) (the "Committee") will administer the Incentive Plan. The maximum aggregate grant-date fair value of awards granted and cash fees paid to any non-employee director pursuant to the Incentive Plan during any fiscal year may not exceed a total value of $500,000, provided that the non-employee directors who are considered independent (under the rules of The Nasdaq Stock Market or other securities exchange on which shares of our common stock are traded) may make exceptions to this limit for a non-executive chair of our Board, if any, in which case the non-employee director receiving the additional compensation may not participate in the decision to award that compensation. Shares of common stock underlying awards under the Incentive Plan that are forfeited, cancelled, expire unexercised or are settled in cash will be available again for new awards under the Incentive Plan. If there is any change in our corporate capitalization, the Committee in its sole discretion may make substitutions or adjustments to the number of shares of common stock reserved for issuance under the Incentive Plan, the number of shares of common stock covered by awards then outstanding under the Incentive Plan, the limitations on awards under the Incentive Plan, the exercise price of outstanding options and such other equitable substitutions or adjustments as it may determine appropriate.

A more complete summary of the terms of the Incentive Plan is set forth in the Proxy Statement in the section entitled "The Incentive Plan Proposal," which is incorporated by reference herein. That summary and the foregoing description are qualified in their entirety by reference to the text of the Incentive Plan, which is filed as Exhibit 10.10 hereto and incorporated herein by reference.





Employment Agreements


Eos OpCo entered into Employment Agreements with Mr. Mastrangelo and Mr. Treece, effective as of June 22, 2020 and June 1, 2020, respectively. For additional information, see the disclosure in the Prospectus in the section entitled "Executive Compensation - Employment Agreements," which is incorporated herein by reference.

The descriptions of the employment agreements incorporated herein with respect to each of Messrs. Mastrangelo and Treece do not purport to be complete and are qualified in their entirety by the terms and conditions of the employment agreements, which are included as Exhibits 10.11 and 10.12, respectively, to this Current Report and are incorporated herein by reference.

Item 9.01 Financial Statement and Exhibits.

(a)-(b) Financial Statements.

Information responsive to Item 9.01(a) and (b) of Form 8-K is set forth in the financial statements included in the Prospectus beginning on page F-1.

The unaudited pro forma condensed combined financial information of the Company as of and for the nine months ended September 30, 2020 and the unaudited pro forma condensed combined statement of operations for the Company for the year ended December 31, 2019 are set forth in Exhibit 99.1 hereto and is incorporated herein by reference.

The consolidated financial statements of Eos OpCo, as of December 31, 2019 and 2018, and as of September 30, 2020 and for the years ended December 31, 2019 and 2018 and the nine months ended September 30, 2020, the related notes and report of independent registered public accounting firm thereto are set forth in the Prospectus beginning on page F-31 and are incorporated herein by reference.





                                       13




The consolidated financial statements of BMRG (i) as of December 31, 2019, (ii) as of September 30, 2020 (unaudited), (iii) for three months ended September 30, 2020 and 2019, and nine months ended September 30, 2020, (iv) for the period from June 3, 2019 (Inception) through September 30, 2019 (v) for the year ended December 31, 2019 , and (vi) the related notes and report of independent registered public accounting firm thereto are set forth in the Proxy beginning on page F-2 and are incorporated herein by reference.





(d) Exhibits-



Exhibit                                                      Incorporated by Reference
                                                                    File                  Filing
Number             Description of Document        Schedule/Form    Number     Exhibits     Date

2.1†            Agreement and Plan of Merger,     Form 8-K        File No.      2.1      September
              dated as of September 7, 2020, by                   001-39291              8, 2020
              and among the Company, BMRG
              Merger Sub, LLC, BMRG Merger Sub
              II, LLC, Eos Energy Storage LLC,
              New Eos Energy LLC and AltEnergy
              Storage VI, LLC (incorporated by
              reference to Exhibit 2.1 of the
              Registrant's Current Report on
              Form 8-K filed with the SEC on
              September 8, 2020).

3.1*            Third Amended and Restated
              Certificate of Incorporation of
              the Company

3.2*            Amended and Restated Bylaws of
              the Company

4.1*            Specimen Common Stock
              Certificate

4.2*            Specimen Warrant Certificate

4.3             Warrant Agreement, dated May      Form S-1/A      File No.      4.4      May 22,
              19, 2020, by and between the                        001-39291              2020
              Registrant and Continental Stock
              Transfer & Trust Company

10.1            Business Combination Marketing    Form 8-K        File No.      1.2      May 22,
              Agreement, dated as of May 19,                      001-39291              2020
              2020 by and between the
              Registrant and B. Riley FBR,
              Inc.

10.2            Letter Agreement, dated May 19,    Form 8-K       File No.      10.1     May 22,
              2020, by and among the                              001-39291              2020
              Registrant, its officers, its
              directors and B. Riley Principal
              Sponsor Co. II, LLC

10.3            Investment Management Trust        Form 8-K       File No.      10.2     May 22,
              Agreement, dated May 19, 2020, by                   001-39291              2020
              and between the Registrant and
              Continental Stock Transfer &
              Trust Company

10.4            Registration Rights Agreement,     Form 8-K       File No.      10.3     May 22,
              dated May 19, 2020, by and                          001-39291              2020
              between the Registrant, B. Riley
              Principal Sponsor Co. II, LLC and
              the Registrant's independent
              directors




                                       14





10.5        Private Placement Units            Form 8-K      File No.    10.4      May 22, 2020
          Purchase Agreement, dated May 19,                  001-39291
          2020, by and between the
          Registrant and B. Riley Principal
          Sponsor Co. II, LLC

10.6        Administrative Support             Form 8-K      File No.    10.6      May 22, 2020
          Agreement, dated May 19, 2020, by                  001-39291
          and between the Registrant and B.
          Riley Corporate Services, Inc.

10.7*       Form of Subscription Agreement


10.8*       Sponsor Earnout Letter

10.9*       Registration Rights Agreement,
          dated November 16, 2020, by and
          among the Company and the
          securityholders party thereto.

10.10*      B. Riley Principal Merger Corp.
          II 2020 Incentive Plan

10.11*      Employment Agreement, dated
          June 22, 2020, by and between the
          Company and Joe Mastrangelo

10.12*      Employment Agreement, dated
          June 1, 2020, by and between the
          Company and Mack Treece

10.13*      Form of Indemnity Agreement

16.1*       Letter from Marcum LLP to the
          SEC, dated November 20, 2020

21.1*       Subsidiaries of the Company

99.1*       Unaudited Pro Forma Condensed
          Financial information of the
          Company



† Certain of the exhibits and schedules to this Exhibit have been omitted in

accordance with Regulation S-K Item 601(a)(5). The Registrant agrees to furnish

a copy of all omitted exhibits and schedules to the SEC upon its request.






 * Filed herewith.




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